Observation of B+->Lambdac+Lambdac-K+ and B0->Lambdac+Lambdac-K0 decays
The Belle Collaboration, N. Gabyshev
Abstract
We report first measurements of the doubly charmed baryonic B decays B->Lambdac+Lambdac-K. The B+->Lambdac+Lambdac-K+ decay is observed with a branching fraction of (6.5+1.0-0.9+-1.1+-3.4)x10-4 and a statistical significance of 15.4sigma. The B0->Lambdac+Lambdac-K0 decay is observed with a branching fraction of (7.9+2.9-2.3+-1.2+-4.2)x10-4 and a statistical significance of 6.6sigma. The branching fraction errors are statistical, systematic, and the error resulting from the uncertainty of Lambdac+->pK-pi+ decay branching fraction. The analysis is based on 357fb-1 of data accumulated at the Y(4S) resonance with the Belle detector at the KEKB asymmetric e+e- collider.
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